I could serge you could serge she could serge we could serge you could serge they could serge
Forma con V-ing
I could be serging you could be serging she could be serging we could be serging you could be serging they could be serging
Perfecto
I could have serged you could have serged she could have serged we could have serged you could have serged they could have serged
Perfecto con V-ing
I could have been serging you could have been serging she could have been serging we could have been serging you could have been serging they could have been serging
Negación
Forma simple
I could not serge you could not serge she could not serge we could not serge you could not serge they could not serge
Forma con V-ing
I could not be serging you could not be serging she could not be serging we could not be serging you could not be serging they could not be serging
Perfecto
I could not have serged you could not have serged she could not have serged we could not have serged you could not have serged they could not have serged
Perfecto con V-ing
I could not have been serging you could not have been serging she could not have been serging we could not have been serging you could not have been serging they could not have been serging
Forma interrogativa
Forma simple
could I serge? could you serge? could she serge? could we serge? could you serge? could they serge?
Forma con V-ing
could I be serging? could you be serging? could she be serging? could we be serging? could you be serging? could they be serging?
Perfecto
could I have serged? could you have serged? could she have serged? could we have serged? could you have serged? could they have serged?
Perfecto con V-ing
could I have been serging? could you have been serging? could she have been serging? could we have been serging? could you have been serging? could they have been serging?
Forma interro-negativa
Forma simple
could I not serge? could you not serge? could she not serge? could we not serge? could you not serge? could they not serge?
Forma con V-ing
could I not be serging? could you not be serging? could she not be serging? could we not be serging? could you not be serging? could they not be serging?
Perfecto
could I not have serged? could you not have serged? could she not have serged? could we not have serged? could you not have serged? could they not have serged?
Perfecto con V-ing
could I not have been serging? could you not have been serging? could she not have been serging? could we not have been serging? could you not have been serging? could they not have been serging?